Add Cloud.ru provider

[D00Movenok]

Hi there!

I adapted Azure provider for Cloud.ru. All existing labs supported (including TEMPLATE :)) with all existing goad.sh tasks and installation manual. Architecture is the same as in Azure.

Also some refactoring was done: I have created terraform/ folder with all reusable terraform code converted to modules. The idea is the next:

terraform/
   cloudru/          # reusable terraform code for cloudru deployments (DONE)
   azure/            # reusable terraform code for azure deployments (TBD)
   otherlab/         # reusable terraform code for any other lab deployments (TBD)

This was done because I saw that all terraform deployments reusing the same code in all labs, now cloudru provider just imports terraform/cloudru/ as a module with per-lab-defined variables and does not write the same code in all labs. Hope this will decrease code reuse a lot. However, other terraform labs (Azure, Proxmox) must be adapted separately (for now I have no resources for that, sorry).

Also fixed some issues (without them some labs may be broken):

• Included fix from Added download and installation of VC_redist.x64.exe #256, but in a more elegant way, because without it installation of ODBC MSSQL 18 in SCCM was broken.
• Fixed DnsServer module failed to load properly on DC02 #218 as it was done for DC01 and DC03 because GOAD provisioning for child dc was broken.
• Some typo and logical mistakes.

FYI: Cloud.ru is one of the most popular cloud providers in Russia and CIS.